01 - In a medium bowl, toss the chicken strips with olive oil, Cajun seasoning, salt, and black pepper until they are evenly coated.
02 - Heat a large skillet over medium-high heat. Add the seasoned chicken and cook for 4 to 5 minutes, or until browned and cooked through. Transfer the cooked chicken to a plate.
03 - In the same skillet, add an additional splash of oil if necessary. Sauté the diced bell peppers, sliced red onion, and minced garlic for 3 to 4 minutes, until they have softened. Remove from heat.
04 - Wipe the skillet clean. Place one flour tortilla in the skillet over medium heat. Sprinkle one-quarter of the shredded cheddar and mozzarella cheeses over half of the tortilla.
05 - Top the cheese with one-quarter of the cooked chicken, the sautéed vegetables, and the fresh cilantro, if using. Fold the tortilla in half to enclose the filling.
06 - Cook the folded quesadilla for 2 to 3 minutes per side, until the tortilla is golden brown and the cheese is fully melted. Repeat this process with the remaining tortillas and filling.
07 - Cut each quesadilla into wedges. Serve immediately with sour cream, salsa, and lime wedges on the side.